TRANSMISSION VOLTAGE LOSS COMPENSATION CIRCUIT, COMPENSATION METHOD, CONTROLLING CHIP AND SWITCHING POWER SUPPLY

摘要

In one embodiment, a method of compensating for transmission voltage loss from a switching power supply, can include: (i) receiving a sampling signal that represents an output current of the switching power supply; (ii) delaying the sampling signal to generate a delayed sampling signal; (iii) converting the delayed sampling signal to generate a compensation signal; and (iv) regulating an output voltage of the switching power supply based on the compensation signal to compensate for the transmission voltage loss from the output voltage transmission to a load such that a voltage at the load is maintained as substantially consistent with an expected voltage at the load.

主权项

1. A method of compensating for transmission voltage loss from a switching power supply, the method comprising:
a) receiving, in a current feedback circuit, a feedback signal from a feedback terminal that is coupled to an auxiliary winding of said switching power supply, and a signal from a common node of a sampling resistor and a main switch of said switching power supply; b) generating, by said current feedback circuit, a sampling signal that represents an output current of said switching power supply, wherein said sampling signal is generated from said feedback signal and said common node signal; d) converting said sampling signal to a compensation signal; and e) regulating an output voltage of said switching power supply based on said compensation signal and said feedback signal to compensate for said transmission voltage loss from said output voltage transmission to a load such that a voltage at said load is maintained as substantially consistent with an expected voltage at said load.